.App {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 5px;
  padding: 5px;
}

.card {
  box-shadow: 0px 0px 5px 1px rgba(128, 128, 128, 0.438);
  width: 300px;
  height: 300px;
  padding: 5px;
}

/* 直接子代选择器 */
.card > .title {
  font-size: 20px;
  font-weight: 800;
  padding-bottom: 5px;
  border-bottom: 1px solid black;
}

.card > .content {
  padding-top: 5px;
}
